Solvin Zankl / After an incubation period of 45 to 55 days and several days long ascent through the sand the hatchling Olive ridley turtles (Lepidochelys olivacea) emerge all together. Ostional Beach, Costa Rica, No...

Pete Oxford / Waved albatross (Phoebastria irrorata) pair at nest after change over for incubation, Punta Suarez, Española Island, Galapagos Islands

Fred Bavendam / Australian Giant Cuttlefish (Sepia apama) hatchling swimming past the egg of an unhatched sibling after an incubation of about four months, southern Australia

Fred Bavendam / Horseshoe Crab (Limulus polyphemus) eggs almost ready to hatch after two weeks incubation in the warm sands of Cape Anne, Massachusetts

WILLIAM OSBORN / Canada goose sitting on eggs at nest {Branta canadensis} Wiltshire England UK

David Perpinan / Artificial incubation of eggs obtained from wild female Diamondback terrapins (Malaclemys terrapin) that died after a road traffic accident. Georgia, United States, Rehabilitation Centre. Small repro...

David Perpinan / Hatching of an egg from an African spurred tortoise (Geochelone sulcata) after artificial incubation. Captive small repro only

Sandesh Kadur / Pair of Blue footed boobies (Sula nebouxii) changing over incubation duties at nest, Galapagos Islands, Ecuador.

Konrad Wothe / Pair of Black woodpeckers (Dryocopus martius) exchanging incubation duties at nest, Bavaria, Germany, April.

Tui De Roy / Sierra Negra Galapagos tortoise (Chelonoidis nigra guentheri), tortoise embryos showing development stages over four months of incubation period, Arnaldo Tupiza Breeding Centre, Isabela Island, Galapa...

Hermann Brehm / Black woodpecker (Dryocopus martius) male and female swapping incubation duty, Rothenburg, Germany. March.

Nick Upton / Female Common/Eurasian crane (Grus grus) 'Chris', released by the Great Crane project in 2010, returning to her nest in a sedge marsh to relieve her partner 'Monty' of incubation duties, Slimbridge, G...